/Engine/Plugins/JsonBlueprintUtilities/Source/JsonBlueprintUtilities/Public/JsonBlueprintFunctionLibrary.h
Checks if the field exists on the object.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Json") static bool HasField ( const [FJsonObjectWrapper](API\Runtime\JsonUtilities\FJsonObjectWrapper) & JsonObject, const [FString](API\Runtime\Core\Containers\FString) & FieldName )